Desiccant Plastic Composition for Moisture Control
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Solution Overview
Problem
Conventional desiccants in granular form are inadequate for maintaining product integrity and moisture control in sensitive products due to lack of structural strength and efficient moisture absorption in environmental exposure.
Innovation Solution
A shaped article comprising an injection molded desiccant plastic composition with silica gel, high-density polyethylene, and ethylene-vinyl acetate copolymer, providing enhanced moisture uptake and mechanical strength, specifically a cylindrical shape with a diameter of at least 8 mm, wall thickness of 0.4 mm, and length of 50 mm, achieving a moisture uptake rate of at least 20 mg in 24 hours and stiffness of 25 Newtons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional granular desiccants are used, then moisture absorption function is provided, but structural strength and product integrity are insufficient
Solution Approach 1:
The patent combines granular desiccant material with thermoplastic polymer to form a composite desiccant product. The desiccant particles are embedded within the polymer matrix, creating a composite structure that provides both moisture absorption capability and mechanical strength. The polymer acts as a binding medium that holds the desiccant particles together, preventing them from breaking apart while maintaining their moisture-absorbing functionality.
Solution Approach 2:
The thermoplastic polymer forms a flexible matrix that encapsulates the desiccant particles. This polymer shell provides structural integrity and flexibility to the desiccant product, allowing it to maintain its shape and resist breaking while still permitting moisture vapor to reach the desiccant particles for absorption.
2Reliability
If granular desiccants are used, then moisture absorption is provided, but resistance to breaking and cracking is insufficient
Solution Approach 1:
The composite structure of desiccant particles embedded in thermoplastic matrix provides both moisture absorption functionality and mechanical resistance to breaking. The polymer matrix distributes stress throughout the structure, preventing individual desiccant particles from bearing excessive load and breaking.
Solution Approach 2:
The thermoplastic polymer matrix acts as a cushioning medium that protects the brittle desiccant particles from mechanical stress and impact before they can break. The flexible polymer absorbs and distributes mechanical energy, preventing the desiccant particles from cracking or fragmenting during handling and use.
3Quantity of substance
If desiccant loading is increased to improve moisture uptake, then absorption capacity increases, but mechanical strength may be compromised
Solution Approach 1:
The patent optimizes the formulation parameters including the ratio of desiccant to polymer, the type of thermoplastic used, and processing conditions to achieve the desired balance between desiccant loading and mechanical strength. By carefully controlling these parameters, the composite maintains sufficient structural integrity even at high desiccant loadings.
Solution Approach 2:
The composite material structure allows for high desiccant loading while maintaining mechanical strength through the polymer matrix. The thermoplastic binder provides a continuous phase that holds the desiccant particles together, ensuring that even at 40-60% desiccant loading, the product maintains adequate mechanical properties for handling and use.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a novel combination of absorption kinetics and mechanical strength, preventing cracking and ensuring effective moisture control in packaging for products like diagnostic strips and pharmaceuticals, while maintaining compatibility with food and medicinal products.
Implementation Method 1
the desiccant is silica gel
Data Source
AI summary
In one embodiment, the present invention is a shaped article comprising an injection molded desiccant plastic composition, wherein the shaped article is a cylinder with an outside diameter of at least about 8.00 mm, a wall thickness of at least about 0.4 mm and an overall length of at least about 50.0 mm, wherein the desiccant plastic composition comprises a desiccant and a base polymer of a thermoplastic, and wherein the resulting shaped article has properties including a moisture uptake rate of at least about 20 mg in 24 hour measured by the Desiccant Rate of Absorption Test Procedure and of a stiffness of at least about 25 Newtons measured by the Mechanical Resistance Control test method.